Learning about science needs to be active, collaborative, and connected to the everyday personal lives of children. This book is a collection of humorous conversations, pictures, and activities designed to help children understand how and why changes happen in the world. The focus is on personal experience and how models are developed, how one can reason about the world, and how knowledge about it is constructed. Chapters 1 through 8 are about physical changes: evaporating, condensing, dissolving, crystallizing, mixing, separating, melting, freezing, and boiling. Chapter 9 is an introduction to simple chemical change. The chapters are divided into five sections: dialogue, description and pictures, experiments, questions to write and draw, and guidelines for parents and teachers. (JRH)